Rotary pump



J. s. SHOCKLEY.

ROTARY PUMP.

APPLICATION FILED JAN. 21, 1920. 1,371,121 Patented Mar. 8, 1921.

2 SHEETS-SHEET I.

J. .S. 'SHOCKLEY.

ROTARY PUMP.

APPLICATION FILED 1AN.21, 1920.

gay/magi PATENT OFFICE.

JILES S. SHOCKLEY, 0F NASHVILLE. TENNESSEE.

ROTARY PUMP.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed January 21, 1920. Serial No. 352,958.

To all whom it may concern Be it known that 1, ohms S. SHOCKLEY, acitizen of the United States, residing at Nashville, in the county ofDavidson and State of Tennessee, have invented certain new and usefulImprovements in Rotary Pumps, of which the followin is a specification.

This invention relates to rotary pumps, and more particularly to theduplex type having two pistons mounted near opposite ends of andreceiving power from a single shaft.

One object of the present invention is to reduce to a minimum the numberof parts, fittings and couplings of a pump of this character wherebysuch a pump may be economically constructed and a compact simplestructure produced.

Another object of the present invention is to provide a pump in whichthere is a minimum loss of power, with the greatest piston action,thereby increasing the final efficiency of the machine.

A still further object is to provide an efiiciently operating valvemechanism separating the inlet and discharge currents of water in thepiston chamber.

Still further objects will appear from the description and claimsfollowing, and reside in the particular combination of parts and mode ofoperation herein described.

One embodiment of the present invention is illustrated in theaccompanying drawings, in which- Figure 1, is a front elevation of thecomplete pump. Fig. 2, is a top plan view thereof. Fig. 3, is a sideelevation of said pump. Fig. 4-, is a detail cross section of one of thepiston chambers illustrating the abutment valve arrangement in detail.Fig. 5, is a detail perspective of the abutment valve.

Like reference characters refer to like parts throughout the drawings,wherein numeral 1 designate the rectangular shaped base of the hereindescribed pump. This base may be secured to any proper stand or to thefloor wherever desired. At each end of the rectangle the base 1 has anupright extension 2 upon the top of which are the piston chambers 8 andA appropriately secured to the base by any convenient or proper method,such as by bolts, as shown in the drawings. The piston chambers 3 and Aare closed at their ends bythe heads 3 and 4, also shown as bolted tothe piston chamber covers.

Extending transversely between the pis ton chambers 3 and 4c is a crankshaft 5 having crank arms 13 (Fig. 3) in each of the piston chambers,upon which the piston rotors 12 are mounted. The crank arms 13 areoppositely disposed upon the crank shaft, accordingly, the pistons areoppositely disposed so that in their rotation, one is discharging whilethe other is charging, thereby keeping a continual flow of water fromthe pump. The hub of each piston rotor 12 is provided with a rollerbearing 25 through which the crank arm passes, in the customary manner.Midway between the two piston chambers the shaft 5 has fast thereon asingle pulley 6, which is a driven pulley, receiving power from anyconvenient source by means of the belt 6. As the means for driving isnot a part of the present invention, no illustration or descriptionthereof is given. At each of the bearing points where the shaft 5 passesthrough the respective piston heads, there is provided a roller bearingwithin each of the packing boxes 8. (Figs. 1 and 2). The inner boxes 8are made watertight by means of the packing nuts 7; and the outer boxes8 are so closed by the caps 8, as shown in Fig. 3.

The base 1 of the pump is cast hollow, with a transverse partition 23therein which extends from one side of the base to the other and extendsupwardly in the side ex tensions 2 terminating at the pistonchambers,.thereby dividing this hollow base into two passages'orchannels, designated by the reference characters 10 and 10 for thetransverse channelsin'the base (Fig. 1) and 2 1, 24: for the channels inthe side extensions leading tothe piston chambers (shown best in Fig.4:). It will be noted from Fig. 1 of the drawings that passages 24-, 24:merge with the horizontal channels 10, 10, so as to form continuouschannels on opposite sides of the partition 23.

Attention will now be called to the fact that by casting the base of thepump as above described so that the water circulates therethrough to andfrom the piston chambers, provides a most economical structure becauseof the saving of expensive well made couplings, fittings, pipe, etc,necessary on other types of pumps, and expensive milling upon theinterior of'the cast' base to form these channels. In addition, the

pump is reduced to simple compactness. Also, the working parts and partsrequiring replacement are reduced to a minimum by this construction.

The base 1 has intermediate between its ends an opening 101 on each sideof the pump, which respectively connect with the channels 10, one ofthese openings being an inlet and the, other an outlet for the water.Surrounding each of the openings 101 is a flange 9, bolted to which arethe collars of pipes 11 and 11 respectively. These pipes 11 and 11 leadfrom a source of water supply, on one side, and away from the pump onthe other side, respectively.

Water issupplied to the herein described pump through inlet pipe 11,opening 101, and passes through transverse horizontal passage 10 oneither side of said opening, into the channel 24, leading to the pistonwhich is drawing water in. From here the water is partly forced andpartly sucked through the inlet passage into the piston chamber, istaken up by the piston upon the rotor 12, is discharged through theoutlet passage 24 on the opposite side of the pieton chamber, throughthe connecting trans verse horizontal outlet passage 10, and out fromthe opposite sine of the pump through opening 101 and the outlet pipe11. lVhile one piston is performing the first half of this cycle, theother piston is performing the other half, so that the action of the pistons is alternate and while one piston is discharging, the other pistonis drawing water in.

The piston being mounted upon the eccentric crank arms 13 of the shaft 5described eccentric paths within the piston casti contacting with theinner surfaces thei-v as will be noted from Figs. 8 and of th drawings,the partition 23 does not extend within the chambers so as to touch thepis ton rotor 12 in any of its positions. Because of the eccentric pathof the piston there is a varying distance between the top of thepartition 23 and the piston 12 through which the incoming water from thepassage 24 might escape or leak into the outgoing channel 24" withoutbeing taken up by the piston, and vice versa for the water being dicharged from the piston. Accordingly, to prevent such a situation andthe consequent loss of efficiency in the pump, the present inventioncontemplates an abutment valve indicated at 14. This valve is located inthe channel 24 and extends above the top thereof extending the partition23 to contact with the piston. As shown in detail in Fig. 5, this valve1 1, comprises longitudinally extending arms 15, which are pivoted at 19to the piston casing. These arms are joined together at their free ends,this whole construction constituting a stem for the valve. The stem 15projects around the channel 2 1 into a pocket 18 cast integral with thepiston chamber cover. In the recess of the pocket 18 is located a spring16, with which the end of the stem 15 contacts in such a way as to keepthe spring 16 slightly compressed. The opposite end of the spring 16 issecured tothe protruding end of the bolt 17 which holds the cap of thepocket 18 in position. At the opposite end of the stem 15 there isprovided a broad valve head 20 which is equal in width to the width ofthe inlet channel 24. The head 20 is slightly deeper than the greatestdistance between the upper edge of-the partition 23 and the piston whenfarthest removed from the upper edge of the partition and inclinesdownwardly into the passage 24. The valve head 20 movably held by theaction of the spring 16 on the stem 15, in juxtaposition to the upperend of the partition 23 so as to become an extenuation thereof and atall times is held against the piston rotor 12. Thus, the varying openingbetween the top of the partition 23 and the piston rotor 12 is closed,thereby effectually keeping the currents of water from interminglingwith the consequent loss of efficiency. The valve head is able torespond to the eccentric swing of the piston by means of its pivotedstem and the action of the normally slightly compressed spring 16 whichis further compressed as the piston swings downwardly and reaches itslowermost point, and the head automatically returns as the pistonrecedes, keeping in constant contact therewith.

Between the movable valve head 20 and the partition 23 there remains aslight opening, which varies as the head rises and low ers, throughwhich the water may leak. To prevent such leakage, a packing strip 21 isinserted in a slot on the inlet side of the partition 23 from which itprojects at an angle against the side of the valve head 20. Both theslot and the strip 21 cmrespond width to the width of the valve head andthe inlet passage 24. in order that the strip 21 may yield the inclinedvalve head descends, a series of coiled springs 22 are )lFtCQd in theslot behind the strip 21. Normally, that is to say when the piston is atits point farthest away from the partition 23, the springs 22 areslightly compressed so that the strip is keptin positive but yieldingengagement with the head 20. As the piston in its eccentric rotationdescends forcing the valve head 20 downwardly, the strip 21 is forcedfurther into the recess thereby further compressing the springs 22.Then, as the piston recedes, the springs 22 force the strip outwardlykeeping it constantly in contact with the head 2.0 concurrently as thevalve head 20 is kept in con tact with the piston rotor 12. Hence therecan be no intermingling of the two currents of water in the pistonchambers, nor can there be any leakage between the two channels forthese channels are maintained distinct throughout the entire course oftravel of the water. Of course, what holds true of the incoming currentof water being un able to get into the outgoing channel without beingacted upon by the piston because of the abutment valve 14, also holdstrue of the discharged water from the piston because of the intermediateposition of the valve let.

The abutment valve 14 and the cooperating mechanism, and the packingstrip 21 have all been described for one piston chamber only. This hasbeen done for convenience in understanding. There is a similar valve andcooperating mechanism, and a similar packing strip cooperating with thevalve head in each of the piston chambers.

I claim:

1. A rotary pump of the character described, comprising a base formedhollow with a transverse partition extending from one side to the other,said base having upright extensions at the ends into which saidpartition extends, there being channels and passages formed incontinuity with each other on opposite sides of said partition, pistonchambers on said extensions, a crank shaft extending transverselybetween said piston chambers and having crank arms in said chambers,piston rotors mounted on said crank shafts and oppositely disposed and apulley on said shaft between said chambers.

2. A rotary pump of the character described, comprising a base formedhollow with a transverse partition extending from one side to the other,said base having upright extensions at the ends into which saidpartition extends, there being channels and passages formed incontinuity with each other on opposite sides of said partition, pistonchambers on said extensions, a crank shaft extending transverselybetween said piston chambers and having crank arms in said chambers,piston rotors mounted on said crank shafts and oppositely disposed, apulley on said shaft between said chambers, and an abutment valve havinga stem projecting into a pocket formed in the piston chamber cover.

3. A rotary pump of the character described, comprising a'base formedhollow with a transverse partition extending from the one side to theother, said base having upright extensions at the ends into which saidpartition extends, there being channels and passages formed incontinuity with each other on opposite sides of said partition, pistonchambers on said extensions, a crank shaft extending transverselybetween said piston chambers and having crank arms in said chambers,piston rotors mounted on said crank shafts and oppositely disposed, apulley on said shaft between said chambers, and means for varying theopening between the top of said partition and the piston rotors.

I. A rotary pump of the character described, comprising a base formedhollow with a transverse partition extending from one side to the other,said base having upright extensions at the ends into which saidpartition extends, there being channels and passages formed incontinuity with each other on opposite sides of said partition, pistonchambers on said extensions, a crank shaft extending transverselybetween said piston chambers and having crank arms in said chambers,piston rotors mounted on said crank shafts and oppositely disposed, apulley on said shaft between said chambers, the piston rotors beingmounted for eccentric rotation, a valve head adapted to be forceddownwardly by such piston rotors, and a spring-actuated stripcooperatively ar ranged, as and for the purpose specified.

5. In a rotary pump of the character described including a base havingopenings at its center and lateral channels from each side of saidopenings, piston casings at the outer ends of the channels, aneccentrically mounted piston in each casing, a shaft and crank armcarrying each piston, and an a'butment valve in the casing and operatingon the piston, said valve being pivotally mounted in the piston casing,and a spring arranged to act upon the stem of said valve whereby thespring is normally slightly compressed.

6. In a rotary pump of the character described, including a base havingan inlet and an outlet opening at substantially a middle point and atdifferent sides thereof and lateral channels terminating at saidopenings, piston casings at the outer ends of the base and the channels,a shaft, a piston in each casing and at the ends of the shaft, crankarms on the shaft and carrying the pistons eccentrically, and abutmentvalves yieldingly mounted to play against the edges of the pistonspivotally mounted in the piston casing, a spring bearing upon the stemof said bolt, said valve being in the form of a broad head equal inwidth to the inlet channel to the piston chamber.

In testimony whereof I affix my signature.

JILES S. SHOCKLEY.

